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Let's say due to a very early POD that there was another group of civilizations beyond the reach of the Bronze Age collapse that regularly traded and exchanged knowledge with the region. The second region is slightly ahead in technology and development. During the OTL Bronze Age Collapse people in the Mediterranean regressed so much that they forgot how to write.
With this umbilical to another region would it not have been as bad? How much would people forget? How long would it have taken to recover?